I am looking for alternate history stories/books about Japan colonizing Mexico and maybe parts of Central America. Help?
Have you checked Uchronia?
Can’t find anything there.
Neither can I. Uchronia is pretty comprehensive which makes me think nobody has written anything using that idea.
I see Aliette De Bodard wrote a series of stories based on the AH that China established colonies in the Americas. But nothing on Japan.
Unless you move forward to the 20th century and are looking for AHs where the Axis wins World War II. Then you have works like Philip K. Dick’s The Man in the High Castle, William Overgard’s The Divide and C.M. Kornbluth’s “Two Dooms”. All of these, however, focus more on a Japanese occupation of the former United States with the occupation of Mexico and Central America just being in the background.
Not really.
I just asked the JOF Facebook group and so far they, too, are stumped.
Best I can find is China colonizing Mexico, etc., in the 15th century
Well, there are-
How Few Remain, Harry Turtledove, which has an alternative Mexican war.
The U.S.-Mexican War of 2017, Anthony Genualdi.
.
And which of these has Japan colonizing Mexico and/or Central America?
Neither, sorry, but they were as close as I could come. I think we have already figured there are no books which match exactly what you want. Just trying to be helpful.
Here’s a discussion on an alternate history site about how a Japan conquers Mexico scenario might work
I guess I got a little lost while reading it. Could you link to the part where they discuss the scenario of Japan possible conquering Mexico? Thank you.
I was mistaken - the discussion is about east Asian countries becoming colonial powers, but not of the Americas (of Europe instead). D’oh
I seem to remember Japan colonizing North America in “The years of rice and salt” by Kim Stanley Robinson.
I believe that was China.
I think you are right, sorry.
You would think Eric Flint’s vast cornucopia of alternate realities would have panned out… 
Here is a very short alternative history story along the broad lines of the op, followed by more reality-based discussion in the comments. > Reddit
The story was rough but true to what I requested, and the responses are interesting.
But…“Samurai Gauchos”?
Damnnice pull.
Mind my asking? What inspired this particular curiosity?